System for monitoring a vehicle with pneumatic tires, signal analysis method, and vehicle tire
First Claim
1. A system for monitoring a vehicle with pneumatic tires, comprising:
- a pressure sensor disposed to sense a tire inflation pressure of at least one wheel of the vehicle and to output a sensor output signal;
a deformation sensor for sensing deformations of a tire, joined to a sidewall of the tire at a location that is subject to strong deformation when a pneumatic pressure in the tire is too low in relation to a weight of the vehicle, said deformation sensor generating an output signal in dependence on the deformation of the sidewall;
an analysis unit;
a data transmission device for transmitting the sensor output signal of said pressure sensor and the output signal of said deformation sensor to said analysis unit;
said analysis unit including a filtering device configured to subject the output signal from said deformation sensor to low-frequency filtering in dependence on a speed of rotation of the wheel, to generate a signal substantially corresponding to a quasi-static tire deformation, and to high-frequency filtering in dependence on the speed of rotation of the wheel, to generate a signal characterizing a nature of a road surface.
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Accused Products
Abstract
A system for monitoring a vehicle fitted with pneumatic tires has, on at least one wheel of the vehicle, a pressure sensor for sensing the tire inflation pressure, and a deformation sensor joined to the tire for sensing deformations of the tire. A data transmission device transmits the output signals from the sensors to an analysis device, which determines from the output signals a result in dependence on the output signals from the two sensors. Frequency-dependent analysis is employed to derive, from the output signals from the deformation sensor, a signal corresponding to the static loading on the tire and a signal corresponding to the nature of the road surface.
34 Citations
18 Claims
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1. A system for monitoring a vehicle with pneumatic tires, comprising:
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a pressure sensor disposed to sense a tire inflation pressure of at least one wheel of the vehicle and to output a sensor output signal; a deformation sensor for sensing deformations of a tire, joined to a sidewall of the tire at a location that is subject to strong deformation when a pneumatic pressure in the tire is too low in relation to a weight of the vehicle, said deformation sensor generating an output signal in dependence on the deformation of the sidewall; an analysis unit; a data transmission device for transmitting the sensor output signal of said pressure sensor and the output signal of said deformation sensor to said analysis unit; said analysis unit including a filtering device configured to subject the output signal from said deformation sensor to low-frequency filtering in dependence on a speed of rotation of the wheel, to generate a signal substantially corresponding to a quasi-static tire deformation, and to high-frequency filtering in dependence on the speed of rotation of the wheel, to generate a signal characterizing a nature of a road surface. - View Dependent Claims (2, 3, 4, 5, 6, 7, 8, 9, 10, 11, 16, 17, 18)
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12. A method of analyzing an output signal from a pneumatic tire deformation sensor affixed on or in a sidewall of the tire that is subject to deformation when a pneumatic pressure value is too low, the method which comprises:
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analyzing a low-frequency range of the output signal, correlating with a wheel rotation speed to generate a correlated signal, and averaging the correlated signal to generate an averaged signal, for generating from the averaged signal a signal substantially corresponding to a static loading on the pneumatic tire; and analyzing a high-frequency range of the output signal, correlating with the wheel rotation speed to generate a correlated signal, and generating, from the correlated signal, a signal representing the nature of the road surface.
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13. A vehicle tire, comprising:
- a sidewall subject to sidewall deformation when a tire inflation pressure is insufficient, and a deformation sensor disposed in or on said sidewall of the tire in a region thereof where said sidewall deforms when the tire inflation pressure is insufficient.
- View Dependent Claims (14, 15)
Specification